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Dual mode relaxation oscillator generating a clock signal operating at a frequency substantially same in both first and second power modes

  • US 7,005,933 B1
  • Filed: 07/24/2001
  • Issued: 02/28/2006
  • Est. Priority Date: 10/26/2000
  • Status: Expired due to Fees
First Claim
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1. An oscillator circuit comprising:

  • a relaxation oscillator circuit;

    a first current source for establishing a first reference voltage for use in causing said relaxation oscillator circuit to operate in a first power mode to generate a clock of a first accuracy;

    a second current source for establishing a second reference voltage for use in causing said relaxation oscillator circuit to operate in a second power mode to generate a clock of a second accuracy, wherein said first current source is not operable to establish said second reference voltage; and

    a control coupled to said first current source and said second current source for switching between said first power mode and said second power mode, wherein said relaxation oscillator circuit generates a clock signal operating at a frequency that is substantially the same in both said first power mode and said second power mode.

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